Comboboxes and forms in functions

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    • #184862
      Topics: 2
      Replies: 3
      Points: 30
      Rank: Member


      I’m trying to build a module of functions relating to building forms. This might already have been done but its a good way to learn and I’ve hit a snag. The code below should generate a form with a text box and two comboboxes. This works fine except for the fact that the combo box generated by the function fails to return any data compare to the other one which seems to work fine!

      Can anyone see where I’ve gone wrong? I’m assuming that its something in the Combobox function.

      $Name = ""
      $Office = ""
      $Office2 = ""
      # This Function Generates a ComboBox
      function Add-TPN2ComboBox ($x=120, $y=10, $width=100, $height=20, $values, $text, $Outputvariable) {
          $ComboBox = new-object System.Windows.Forms.ComboBox
          $ComboBox.Location = new-object System.Drawing.Size($x,$y)
          $ComboBox.Size = new-object System.Drawing.Size($width,$height)
          $ComboBox.Text = $text
          ForEach ($value in $values) {
      # This Function Generates a label
      function Add-TPN2Label ($text="label text", $x=10, $y=10, $width=100, $height=20) {
      	$objLabel = New-Object System.Windows.Forms.Label
      	$objLabel.Text = "$text"
      	$objLabel.Location = New-Object System.Drawing.Size($x,$y) 
      	$objLabel.Size = New-Object System.Drawing.Size($width,$height) 
      function Add-TPNButton($text="OK", $x=240, $y=10, $width=75, $height=20, $action){
          $objButton = New-Object System.Windows.Forms.Button
          $objButton.Location = New-Object System.Drawing.Size($x,$y)
          $objButton.Size = New-Object System.Drawing.Size($width,$height)
          $objButton.Text = "$text"
      $Form = New-Object System.Windows.Forms.Form
      $Form.width = 450
      $Form.height = 500
      $Form.StartPosition = "CenterScreen"
      $Form.Topmost = $True
          $y = 10 #The initial margin from the top, 10 px is the default value if not specified.
          $Values = @("Bristol", "Manchester", "Burton", "London", "Bangkok")
          Add-TPN2Label -text "Firstname" -y $y
          $FirstName = Add-TPNTextbox -y $y -text "John"
          $y = $y + 30
          #Add an Office drop-down box to the form.
          Add-TPN2Label -text "Office:" -y $y  #Add a label to the Office dropdown.
          $ComboBoxOffice = new-object System.Windows.Forms.ComboBox
          $ComboBoxOffice.Location = new-object System.Drawing.Size(120,$y)
          $ComboBoxOffice.Size = new-object System.Drawing.Size(130,30)
          ForEach ($Value in $Values) {
          $y = $y + 30
          Add-TPN2Label -text "Office2" -y $y
          $ComboBoxOffice2 = Add-TPN2Combobox -y $y -values $Values -width 130
          $y = $y + 30
          Add-TPNButton -Action {$this.Parent.Close()} -y $y -text "OK"
      [void] $Form.ShowDialog()
      write-host "Name: " $Firstname.Text
      write-host "Office: " $ComboBoxOffice.SelectedItem
      write-host "Office2: " $ComboBoxOffice2.SelectedItem
    • #185141
      Topics: 5
      Replies: 106
      Points: 273
      Helping Hand
      Rank: Contributor

      I think you are always creating combo box in to the same object so it does not make a new one for you. I suppose you should give the combo box name as parameter in the function and use that in the new-object System.Windows.Forms.ComboBox

    • #185192
      Topics: 0
      Replies: 14
      Points: 141
      Rank: Participant


      I don’t think you’ve given us the full script, as on my machine an error is generated referring to Add-TPNTextbox which isn’t included in the script.

      If I remove the reference to Add-TPNTextbox then the form is created with 2 comboboxes, both having the same content. You are capturing the output of Add-TPN2ComboBox as if it should be a combobox object, but it’s just the result of the ComboBox.Items.Add() method, a series of numbers.

      If you insert this immediately below line 14:

      Return $ComboBox

      then you should get the result you’re after, as Add-TPN2ComboBox then returns a combo box object.

      Hope this helps,


      • #185273
        Topics: 2
        Replies: 3
        Points: 30
        Rank: Member

        Thanks Stuart!

        That was just the trick. I had looked at that for way to long.

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